【Android】_MyContentProvider_外部访问接口

一、新建MycontentProvider
【Android】_MyContentProvider_外部访问接口_第1张图片
权限设置：

MyContentProvider.java:

package com.example.z.student;import android.content.ContentProvider;import android.content.ContentValues;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.net.Uri;import android.support.annotation.NonNull;import android.support.annotation.Nullable;public class MyContentProvider extends ContentProvider {    @Override    public boolean onCreate() {        return false;    }    @Override    public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder) {        MySQLiteAccess database=new MySQLiteAccess(this.getContext(),3);        SQLiteDatabase sqLiteDatabase=database.getReadableDatabase();        String sql="select *from students ";        Cursor cursor=sqLiteDatabase.rawQuery(sql,null);        System.out.println("查询成功！");        return cursor;    }    @Nullable    @Override    public String getType(@NonNull Uri uri) {        return null;    }    @Nullable    @Override    public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {        return null;    }    @Override    public int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {        return 0;    }    @Override    public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {        return 0;    }}

二、接收端：(另一个app)
【Android】_MyContentProvider_外部访问接口_第3张图片

java:

package com.example.cungu.myapplication4;import android.content.ContentResolver;import android.content.ContentValues;import android.database.Cursor;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import java.net.URI;public class StuActivity extends AppCompatActivity implements View.OnClickListener {    private TextView texts;    private Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_stu);        texts=(TextView)findViewById(R.id.texts);        button=(Button)findViewById(R.id.button);        button.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.button:                search();                break;        }    }    public void insert(){        ContentResolver resolver = getContentResolver();// 获取ContentResolver        Uri uri = Uri.parse("content://provider/student");        // 插入表中数据        ContentValues values = new ContentValues();        values.put("id", "6");        values.put("name", "test");        values.put("sex", "男");        values.put("age", "20");        values.put("academy", "信息科学与工程");        values.put("major", "物联网工程");        values.put("date", "19980101");        // 通过ContentResolver 根据URI 向ContentProvider中插入数据        Uri result=resolver.insert(uri, values);        String n=result.getPath();        Toast.makeText(this, n, Toast.LENGTH_SHORT).show();        Toast.makeText(this, "插入成功！", Toast.LENGTH_SHORT).show();    }    public void search(){        ContentResolver resolver=getContentResolver();        Uri uri=Uri.parse("content://Student");        Cursor cursor=resolver.query(uri,null,null,null,null);        if(cursor!=null)            while (cursor.moveToNext()){                String id=cursor.getString(cursor.getColumnIndex("id"));                String name=cursor.getString(cursor.getColumnIndex("name"));                String sex=cursor.getString(cursor.getColumnIndex("sex"));                String age=cursor.getString(cursor.getColumnIndex("age"));                String academy=cursor.getString(cursor.getColumnIndex("academy"));                String major=cursor.getString(cursor.getColumnIndex("major"));                String date=cursor.getString(cursor.getColumnIndex("date"));                texts.append("\n"+id+" "+name+" "+sex+"  "+age+"  "+academy+"  "+major+"  "+date+"  ");            }    }}

三、应用效果：

student.app：
【Android】_MyContentProvider_外部访问接口_第4张图片

这里为select * from students，可以加细一点，弄成关键词搜索。

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